<?php

namespace app\helper\controller;

class Agent
{
    // 设备类型
    const DEVICE_MOBILE  = 1;
    const DEVICE_DESKTOP = 2;
    const DEVICE_UNKNOWN = -1;

    // 浏览器类型
    const BROWSER_TYPE_IPHONE  = 1;
    const BROWSER_TYPE_IPAD    = 2;
    const BROWSER_TYPE_IPOD	   = 3;
    const BROWSER_TYPE_ANDROID = 4;
    const BROWSER_TYPE_UNKNOWN = -1;

    // 系统类型
    const OS_TYPE_IOS	  = 1;
    const OS_TYPE_ANDROID = 2;
    const OS_TYPE_UNKNOWN = -1;

    // 是否RETINA屏
    const RETINA_TYPE_YES = 1;
    const RETINA_TYPE_NOT = 0;

    // 是否IOS6系统
    const IOS6_YES = 1;
    const IOS6_NOT = 0;

    // 是否微信打开
    const MICRO_MESSAGE_YES = 1;
    const MICRO_MESSAGE_NOT = 0;

    // APP已经安装
    const APP_INSTALLED_YES = 1;
    const APP_INSTALLED_NOT = 0;

    // 得到agent完整类型信息
    public static function getDeviceInfo()
    {
        return array(
            'deviceType'  => self::deviceType(),
            'browserType' => self::browserType(),
            'isRetina' 	  => self::isRetina(),
            'osType' 	  => self::osType(),
            'isIos6' 	  => self::isIos6(),
        );
    }

    // 浏览器类型
    public static function browserType($agent = '')
    {
        $agent = self::getAgent($agent);

        if (stripos($agent, 'iphone') !== false) {
            return self::BROWSER_TYPE_IPHONE;
        }

        if (stripos($agent, 'ipad') !== false) {
            return self::BROWSER_TYPE_IPAD;
        }

        if (stripos($agent, 'ipod') !== false) {
            return self::BROWSER_TYPE_IPOD;
        }

        if (stripos($agent, 'android') !== false) {
            return self::BROWSER_TYPE_ANDROID;
        }

        return self::BROWSER_TYPE_UNKNOWN;
    }

    // 系统类型
    public static function osType($agent = '')
    {
        $agent = self::getAgent($agent);
        $browserType = self::browserType($agent);

        switch ($browserType) {
            case self::BROWSER_TYPE_IPHONE:
            case self::BROWSER_TYPE_IPAD:
            case self::BROWSER_TYPE_IPOD:
                $osType = self::OS_TYPE_IOS;
                break;
            case self::BROWSER_TYPE_ANDROID:
                $osType = self::OS_TYPE_ANDROID;
                break;
            default:
                $osType = self::OS_TYPE_UNKNOWN;
        }

        return $osType;
    }

    // 设备类型
    public static function deviceType()
    {
        if (self::isMobile()) {
            return self::DEVICE_MOBILE;
        } else {
            return self::DEVICE_DESKTOP;
        }
    }

    // retina屏
    public static function isRetina($agent = '')
    {
        $agent = self::getAgent($agent);
        $osType = self::osType($agent);

        if (($osType == self::OS_TYPE_IOS) && (self::isIos6($agent) != 1)) {
            return self::RETINA_TYPE_YES;
        } else {
            return self::RETINA_TYPE_NOT;
        }
    }

    // ios6系统的手机(iphone4, iphone4s)
    public static function isIos6($agent = '')
    {
        $agent = self::getAgent($agent);

        if (stripos($agent, 'iPhone OS 6')) {
            return self::IOS6_YES;
        } else {
            return self::IOS6_NOT;
        }
    }
    // 检查是否在微信中打开
    public static function isMicroMessage($agent = '')
    {
        $agent = self::getAgent($agent);

        if (stripos($agent, 'MicroMessenger') !== false) {
            return self::MICRO_MESSAGE_YES;
        } else {
            return self::MICRO_MESSAGE_NOT;
        }
    }

    // 已安装APP
    public static function isAppInstalled()
    {
        if (isset($_GET['isappinstalled']) && ($_GET['isappinstalled'] == 1)) {
            return self::APP_INSTALLED_YES;
        } else {
            return self::APP_INSTALLED_NOT;
        }
    }

    // 是移动设备访问
    public static function isMobile()
    {
        // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
        if (isset($_SERVER['HTTP_X_WAP_PROFILE'])) {
            return true;
        }
        // 如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
        if (isset($_SERVER['HTTP_VIA']) && stristr($_SERVER['HTTP_VIA'], "wap")) {
            return true;
        }
        // 脑残法，判断手机发送的客户端标志,兼容性有待提高
        if (isset ($_SERVER['HTTP_USER_AGENT'])) {
            $clientkeywords = array('nokia', 'sony', 'ericsson', 'mot', 'samsung', 'htc', 'sgh', 'lg', 'sharp',
                'sie-', 'philips', 'panasonic', 'alcatel', 'lenovo', 'iphone', 'ipod', 'blackberry', 'meizu',
                'android', 'netfront', 'symbian', 'ucweb', 'windowsce', 'palm', 'operamini', 'operamobi', 'openwave',
                'nexusone', 'cldc', 'midp', 'wap', 'mobile');
            // 从HTTP_USER_AGENT中查找手机浏览器的关键字
            if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
                return true;
            }
        }
        // 协议法，因为有可能不准确，放到最后判断
        if (isset($_SERVER['HTTP_ACCEPT'])) {
            // 如果只支持wml并且不支持html那一定是移动设备, 如果支持wml和html但是wml在html之前则是移动设备
            if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) && (strpos($_SERVER['HTTP_ACCEPT'], 'text/html') === false || (strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') < strpos($_SERVER['HTTP_ACCEPT'], 'text/html')))) {
                return true;
            }
        }
        return false;
    }

    public static function getAgent($agent = '')
    {
        $agent = empty($agent) ? $_SERVER['HTTP_USER_AGENT'] : $agent;
        return $agent;
    }
}
